draw/gallivm: add invocation ID support for llvmpipe.

This extends the draw code to add support for invocations.

Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

5 files changed, 14 insertions, 3 deletions

diff --git a/src/gallium/auxiliary/draw/draw_gs.c b/src/gallium/auxiliary/draw/draw_gs.c
index 755e527..a1564f9 100644
--- a/src/gallium/auxiliary/draw/draw_gs.c
+++ b/src/gallium/auxiliary/draw/draw_gs.c
@@ -391,7 +391,8 @@ llvm_gs_run(struct draw_geometry_shader *shader,
       (struct vertex_header*)input,
       input_primitives,
       shader->draw->instance_id,
-      shader->llvm_prim_ids);
+      shader->llvm_prim_ids,
+      shader->invocation_id);
 
    return ret;
 }
diff --git a/src/gallium/auxiliary/draw/draw_llvm.c b/src/gallium/auxiliary/draw/draw_llvm.c
index 9629a8a..90a31bc 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.c
+++ b/src/gallium/auxiliary/draw/draw_llvm.c
@@ -2069,7 +2069,7 @@ draw_gs_llvm_generate(struct draw_llvm *llvm,
    struct gallivm_state *gallivm = variant->gallivm;
    LLVMContextRef context = gallivm->context;
    LLVMTypeRef int32_type = LLVMInt32TypeInContext(context);
-   LLVMTypeRef arg_types[6];
+   LLVMTypeRef arg_types[7];
    LLVMTypeRef func_type;
    LLVMValueRef variant_func;
    LLVMValueRef context_ptr;
@@ -2105,6 +2105,7 @@ draw_gs_llvm_generate(struct draw_llvm *llvm,
    arg_types[4] = int32_type;                          /* instance_id */
    arg_types[5] = LLVMPointerType(
       LLVMVectorType(int32_type, vector_length), 0);   /* prim_id_ptr */
+   arg_types[6] = int32_type;
 
    func_type = LLVMFunctionType(int32_type, arg_types, Elements(arg_types), 0);
 
@@ -2125,6 +2126,7 @@ draw_gs_llvm_generate(struct draw_llvm *llvm,
    num_prims                 = LLVMGetParam(variant_func, 3);
    system_values.instance_id = LLVMGetParam(variant_func, 4);
    prim_id_ptr               = LLVMGetParam(variant_func, 5);
+   system_values.invocation_id = LLVMGetParam(variant_func, 6);
 
    lp_build_name(context_ptr, "context");
    lp_build_name(input_array, "input");
@@ -2132,6 +2134,7 @@ draw_gs_llvm_generate(struct draw_llvm *llvm,
    lp_build_name(num_prims, "num_prims");
    lp_build_name(system_values.instance_id, "instance_id");
    lp_build_name(prim_id_ptr, "prim_id_ptr");
+   lp_build_name(system_values.invocation_id, "invocation_id");
 
    variant->context_ptr = context_ptr;
    variant->io_ptr = io_ptr;
diff --git a/src/gallium/auxiliary/draw/draw_llvm.h b/src/gallium/auxiliary/draw/draw_llvm.h
index 9565fc6..d48ed72 100644
--- a/src/gallium/auxiliary/draw/draw_llvm.h
+++ b/src/gallium/auxiliary/draw/draw_llvm.h
@@ -298,7 +298,8 @@ typedef int
                     struct vertex_header *output,
                     unsigned num_prims,
                     unsigned instance_id,
-                    int *prim_ids);
+                    int *prim_ids,
+                    unsigned invocation_id);
 
 struct draw_llvm_variant_key
 {
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi.h b/src/gallium/auxiliary/gallivm/lp_bld_tgsi.h
index 3f76b79..967373c 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi.h
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi.h
@@ -165,6 +165,7 @@ struct lp_bld_tgsi_system_values {
    LLVMValueRef vertex_id_nobase;
    LLVMValueRef prim_id;
    LLVMValueRef basevertex;
+   LLVMValueRef invocation_id;
 };
 
 
diff --git a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
index 092bd18..268379e 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_tgsi_soa.c
@@ -1532,6 +1532,11 @@ emit_fetch_system_value(
       atype = TGSI_TYPE_UNSIGNED;
       break;
 
+   case TGSI_SEMANTIC_INVOCATIONID:
+      res = lp_build_broadcast_scalar(&bld_base->uint_bld, bld->system_values.invocation_id);
+      atype = TGSI_TYPE_UNSIGNED;
+      break;
+
    default:
       assert(!"unexpected semantic in emit_fetch_system_value");
       res = bld_base->base.zero;